Ricoh DDP92 Maintenance Manual page 178

SW1 (cartridge-R detection) and SW3 (cartridge-F detection) detect presence (and
correct setting) or absence (or improper setting) of the respective staple cartridges.
SW2 (staple detection/R) and SW4 (staple detection/F) come ON when the amount of
staples in the respective cartridge runs low.
Figure 7-30. View of the stapling operation
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Theory of Operation
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